CN101141618A - Demodulation decoding integrated digital television broadcasting program safety authentication method - Google Patents
Demodulation decoding integrated digital television broadcasting program safety authentication method Download PDFInfo
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- CN101141618A CN101141618A CNA2007100712468A CN200710071246A CN101141618A CN 101141618 A CN101141618 A CN 101141618A CN A2007100712468 A CNA2007100712468 A CN A2007100712468A CN 200710071246 A CN200710071246 A CN 200710071246A CN 101141618 A CN101141618 A CN 101141618A
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Abstract
The present invention relates to a method for the safety certification of a digital television broadcasting program. At present, the safety certification to the program is mainly realized through the software configuration, and the security is low. The method of the present invention has the procedures that a preset legal program name is wrote in a ROM; a PST chart is abstracted, and the mapping of a program number of each program and the PID value of a PMT chart are established; a SDT chart is abstracted, and the mapping between the program number and the program name of each program; the corresponding program number of each legal program is detected; the PMT chart of the legal program is abstracted, and the audio and video PID value is decoded; a corresponding TS package of the legal program is identified, and then transmitted to the back level. The method of the present invention integrates a safety certification filter in a digital television demodulator and a decoder, while the legality of program information is checked, the cost is low, therefore ensuring that the TS stream of a flow message source decoder only contains legal contents already checked and passed.
Description
Technical field
The invention belongs to that digital multimedia is handled, field of information security technology, particularly a kind of in the digital television broadcasting Rcv decoder method of integrated program safety certification.
Background technology
At present, exist various security breaches and threat in the television network broadcast.How carrying out effective program examination and filtration, prevent that be harmful to, the illegal program and the propagation of information, is an importance of television network broadcast safe practice.The code stream form that the digital television broadcasting transmission is adopted is the defined transport stream TS of ITU-T Moving Picture Experts Group-2 system layer.In one road TS stream, comprising one or more audio frequency, video-frequency basic flow, and other data flow, program service information and interactive information.TS stream is made up of the TS bag of regular length, indicates various pay(useful) load type by the PID field.
Receiving terminal in digital television broadcasting, it is relevant with following program information table to search the platform process: by Program Association Table PAT, can set up the corresponding relation between the pid value of program number and Program Map Table PMT, wherein program number is the digital label that interrelates with a program; Pmt table is carrying the definition of a relevant program, and it has indicated program number and has formed mapping between the basic stream PID of this program; The SDT table then provides the program names of each program.Resolve by in TS stream, extracting above-mentioned program information table, can set up the programme information index, finish the platform process of searching.
The nucleus module of digital television receiving terminal comprises channel receiver and source decoder.Wherein channel receiver carries out tuning demodulation and channel-decoding to the digital broadcasting code stream that receives; Source decoder then by the demultiplexing to TS stream, is analyzed various programme informations, and the audio frequency and video ES stream that extracts is decoded.To can pass through software arrangements at receiving terminal to the authentication of program implement security, carry out program filtering in the platform process searching of source decoder.Though yet the method for software arrangements is simple and easy to do, easy crack, fail safe is not strong.In digital broadcast television program secure authentication technology, the fail safe of scheme itself also is a very important index.
Summary of the invention
Purpose of the present invention is exactly at the deficiencies in the prior art, proposed a kind ofly can carry out that effective program is selected and monitoring, and high safety, cost low with the method integrated digital television broadcasting program safety authentication of demodulating and decoding.
To achieve these goals, method of the present invention comprises the following steps:
The program names that a. will preset legal program writes among the erasable ROM of writing (read-only memory);
B. from TS stream (Standard Digital Television broadcast transmission stream), extract pat table (Program Association Table), set up the program number of each program and the mapping of pmt table PID (indication field of TS bag type) value;
C. from TS stream, extract SDT table (programm name table), set up the program number of each program and the mapping between the program names;
D. by presetting the program names of legal program among the ROM, detect the pairing program number of each legal program;
E. from TS stream, extract the pmt table (Program Map Table) of legal program, and solve its audio frequency and video pid value;
F. the TS bag with legal program correspondence identifies by the PID filter, and level (demodulation multiplexer in the source decoder) sends backward.
Disposable finishing when described step a is initial setting up, step b～step f carries out for circulating down in working order, wherein:
The concrete grammar of step b is by the PID filter TS bag that comprises pat table in the TS stream to be extracted, and according to standard syntax pat table is resolved, and obtains the program number (digital label of program) of each program and the corresponding relation of pmt table pid value.
The concrete grammar of step c is by the PID filter TS bag that comprises the SDT table in the TS stream to be extracted, and according to standard syntax the SDT table is resolved, and obtains the program number of each program and the corresponding relation of program names.
The concrete grammar of steps d is whether detect each program that is comprised in the current TS stream eligible, if when the content that prestores among program names and the ROM is consistent, confirms that then this program is legal, and its pairing program number mark is come out.
The concrete grammar of step e is the program number according to the legal program that obtains in the steps d, utilize the program number of resultant each program of step b and the corresponding relation of pmt table pid value, obtain the pairing pmt table pid value of each legal program, and the pairing pmt table pid value of all legal programs is inserted in the PID filter; From TS stream, extract the TS bag that includes the corresponding pmt table of each legal program institute by the PID filter, and, obtain the pairing audio frequency and video pid value of each legal program according to standard syntax parsing pmt table.
The concrete grammar of step f is pmt table pid value and the audio frequency and video pid value that obtains legal program according to above-mentioned steps, utilizes another PID filter that the pairing TS bag of legal program is identified and level (demodulation multiplexer in the source decoder) transmission backward.
Again carry out step a when the informational needs of program authentication is upgraded, this step must just can be carried out after by key authentication.
The inventive method is by the authentication of integrated security in Digital Television demodulating and decoding device filter, and when the reception of illegal programs is checked, stoped to the legitimacy to programme information, cost was lower.The safety certification filter adopts the devices at full hardware design, deposits legal name keyword by built-in erasable ROM, prevents from effectively to crack and unauthorized access, improves security of system.In checking process, the PID filter array upgrades timely, guarantees that the TS stream that flows to source decoder only comprises the legal content of passing through on inspection.
Program safety certifying method of the present invention can carry out effective program selection and monitoring, and the TS stream that source decoder is received does not comprise the relevant information and the audio, video data content of illegal programs.Be integrated in the Digital Television demodulating and decoding device as the device that solidifies, have high safety, the characteristics that cost is low.
Description of drawings
Fig. 1 is the Digital Television demodulating and decoding device structured flowchart of one embodiment of the invention;
Fig. 2 is the structured flowchart of one embodiment of the invention technical scheme.
Embodiment
As Fig. 1, the safety certification filter is integrated on the Digital Television demodulating and decoding device.This Digital Television demodulating and decoding device comprises with lower module: channel decoder 101, safety certification filter 102, demodulation multiplexer 103, Video Decoder 104, audio decoder 105.
Each functions of modules is as follows:
Channel decoder 101: finish reception, separate the mediation channel-decoding to TS stream.
Safety certification filter 102: be integrated in the source coding chip, place before the demodulation multiplexer, realize to the effective identification filtration of program and the function of control and management.Its concrete technical scheme will be described below.
Demodulation multiplexer 103: identification and extract that each audio frequency, video, data flow substantially and various programme information from TS stream.
Fig. 2 is the technical scheme structured flowchart according to safety certification filter of the invention process.Comprise with lower module: TS stream receiver 201, parsing PID array 202, PAT resolver 203, PMT resolver 204, SDT resolver 205, erasable ROM memory 206, the erasable module 207 of upgrading, detector 208, filtration PID array 209, TS transmitter 210.
Each functions of modules and implementation process of the present invention are as follows:
TS stream receiver 201: to input TS stream disappear tremble and code stream synchronous, and be sent to and resolve the PID array.
Resolve PID array 202: depositing the PID type that needs parsing, the TS bag with correspondence from TS stream extracts and delivers to corresponding resolver.Wherein the pid value of pat table is fixed as 0x00; The pid value of SDT table is fixed as 0x11; And the pid value of pmt table configurable several, the result who draws according to detector inserts array with the pid value of the pmt table of legal program.
PAT resolver 203: the pat table that the PID array filters out is resolved, set up the mapping of the program number and the pmt table pid value of each program.
PMT resolver 204: the pmt table of the legal program that the PID array is filtered out is resolved, and finds out the pid value that its corresponding audio, video or other data flow substantially.
SDT resolver 205: the SDT table that the PID array filters out is resolved, set up the program number of each program and the mapping between the program names.
Erasable ROM 206: the program names of depositing legal program.Read-only under usual operating state, have only the program that mates with legal program names just to be considered to legal.
The erasable module 207 of upgrading: upgrade when upgrading at the informational needs of the built-in legal program names of ROM, it is erasable that ROM is carried out electricity.And have authentication function, only execution is effectively erasable through key authentication, stops all illegal visit and control informations.
Detector 208: the legal program names of storing among program names that the SDT resolver is learned and the ROM compares, and finds out the program number of legal program; And program number and the pmt table pid value index set up according to pat table, with the pid value of the pmt table of legal program, insert simultaneously and resolve the PID array and filter the PID array.
Filter PID array 209: depositing all legal PID types, comprising the pid value that audio frequency, video or other data that legal program PMT PID that the pid value, the detector that preset obtain and PMT resolver obtain flow substantially.Be filtered the TS bag of PID array detection coupling, will deliver to the TS transmitter, illegal TS bag is then cut resistance.
TS transmitter 210: will detect qualified TS bag, and send to demodulation multiplexer with certain form.
Although the present invention is next specifically described with reference to its preferred embodiment, it should be appreciated by those skilled in the art, under the situation that does not break away from the spirit and scope of the present invention that the claims qualification is arranged, can carry out the various modifications of form and details to it.
Claims (1)
- One kind with the integrated digital television broadcasting program safety authentication method of demodulating and decoding, it is characterized in that this method may further comprise the steps:The program names that a. will preset legal program writes among the erasable ROM of writing;B. from Standard Digital Television broadcast transmitted TS stream, extract the related pat table of program, the mapping of setting up the program number and the program map pmt table pid value of each program;C. from TS stream, extract programm name SDT table, set up the program number of each program and the mapping between the program names;D. by presetting the program names of legal program among the erasable ROM of writing, detect the pairing program number of each legal program;E. from TS stream, extract the program map pmt table of legal program, and solve its audio frequency and video pid value;F. the TS bag with legal program correspondence identifies by the PID filter, and the demodulation multiplexer in source decoder sends;Disposable finishing when described step a is initial setting up, step b～step f carries out for circulating down in working order, wherein:The concrete grammar of step b is by the PID filter TS bag that comprises the related pat table of program in the TS stream to be extracted, and according to standard syntax the related pat table of program is resolved, and obtains the program number of each program and the corresponding relation of pmt table pid value;The concrete grammar of step c is by the PID filter TS bag that comprises programm name SDT table in the TS stream to be extracted, and according to standard syntax programm name SDT table is resolved, and obtains the program number of each program and the corresponding relation of program names;The concrete grammar of steps d is whether detect each program that is comprised in the current TS stream eligible, if when the content that prestores among program names and the ROM is consistent, confirms that then this program is legal, and its pairing program number mark is come out;The concrete grammar of step e is the program number according to the legal program that obtains in the steps d, utilize the program number of resultant each program of step b and the corresponding relation of program map pmt table pid value, obtain the pairing program map pmt table of each legal program pid value, and the pairing program map pmt table of all legal programs pid value is inserted in the PID filter; From TS stream, extract the TS bag that includes the corresponding program map pmt table of each legal program institute by the PID filter, and, obtain the pairing audio frequency and video pid value of each legal program according to standard syntax parsing program map pmt table;The concrete grammar of step f is program map pmt table pid value and the audio frequency and video pid value that obtains legal program according to above-mentioned steps, utilizes another PID filter the pairing TS bag of legal program to be identified and the demodulation multiplexer transmission in source decoder.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100712468A CN101141618A (en) | 2007-09-07 | 2007-09-07 | Demodulation decoding integrated digital television broadcasting program safety authentication method |
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| CNA2007100712468A CN101141618A (en) | 2007-09-07 | 2007-09-07 | Demodulation decoding integrated digital television broadcasting program safety authentication method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102065334A (en) * | 2010-07-21 | 2011-05-18 | 深圳创维数字技术股份有限公司 | Digital television receiver and operation method of demultiplex equipment in mixed application environment |
| CN101656842B (en) * | 2008-08-22 | 2012-09-05 | 深圳Tcl新技术有限公司 | Single frequency point quick channel search method of digital television |
| CN109429110A (en) * | 2017-08-29 | 2019-03-05 | 上海高清数字科技产业有限公司 | The detection and filter method and system of satellite television data |
| CN109429111A (en) * | 2017-08-29 | 2019-03-05 | 上海高清数字科技产业有限公司 | Satellite television list management method and system, headend equipment, receiver |
| CN114221942A (en) * | 2021-12-13 | 2022-03-22 | 杭州国芯科技股份有限公司 | Method for detecting data broadcast in transport stream |
-
2007
- 2007-09-07 CN CNA2007100712468A patent/CN101141618A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101656842B (en) * | 2008-08-22 | 2012-09-05 | 深圳Tcl新技术有限公司 | Single frequency point quick channel search method of digital television |
| CN102065334A (en) * | 2010-07-21 | 2011-05-18 | 深圳创维数字技术股份有限公司 | Digital television receiver and operation method of demultiplex equipment in mixed application environment |
| CN102065334B (en) * | 2010-07-21 | 2013-10-09 | 深圳创维数字技术股份有限公司 | operation method of digital television receiver and demultiplex equipment in mixed application environment |
| CN109429110A (en) * | 2017-08-29 | 2019-03-05 | 上海高清数字科技产业有限公司 | The detection and filter method and system of satellite television data |
| CN109429111A (en) * | 2017-08-29 | 2019-03-05 | 上海高清数字科技产业有限公司 | Satellite television list management method and system, headend equipment, receiver |
| CN109429111B (en) * | 2017-08-29 | 2021-03-16 | 上海高清数字科技产业有限公司 | Satellite television list management method and system, front-end equipment and receiver |
| CN114221942A (en) * | 2021-12-13 | 2022-03-22 | 杭州国芯科技股份有限公司 | Method for detecting data broadcast in transport stream |
| CN114221942B (en) * | 2021-12-13 | 2023-05-16 | 杭州国芯科技股份有限公司 | Method for detecting data broadcast in transport stream |
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Open date: 20080312 |